AUTHOR’S ABSTRACT OF THIS PAPER ISSUED BY 
THE BIBLIOGRAPHIC SERVICE, DECEMBER 22 
SOME EXPERIMENTS ON REGENERATION AFTER 
EXARTICULATION IN DIEMYCTYLUS 
VIRIDESCENS 
C. V. MORRILL 
Department of Anatomy, Cornell University Medical College, New York City 
TEN FIGURES (THREE PLATES) 
The earlier writers (Phillipeaux and Fraisse)! on regeneration 
in urodeles seem to have held the opinion that the extremities of 
adult animals are completely replaced only when one or more 
bones are injured in the amputation, that is to say, not after 
total extirpation (exarticulation). Wound-irritation from an 
injured bone was considered necessary as a stimulus to the re- 
placement of a missing part. Also the bone supplied a ‘tissue- 
rest’? to serve as a matrix. However in young salamanders and 
especially in their larvae, it was found that the regeneration. of 
extremities takes place very readily since here the joints are 
only partially formed and wounding of the bones always occurs 
in amputations. This general conclusion, that in adults re- 
generation does not occur after complete extirpation, seems to 
have been shared by a number of the more recent investigators, 
some, Kochs (97) and Wendelstadt (01 and ’04) expressly 
confirming it, others, Towle (’01), Morgan (’03), Reed (03) and 
Glaeser (10), while not putting it to the test, seem to have taken 
care in their experiments to amputate through a bone. 
Kurz (12) in the course of his experiments on transplantation 
of entire imbs in Triton, found that if the limb is completely 
extirpated (exarticulated) at the hip- or shoulder-joint, a new 
limb regenerates. Presumably no wounding of the bones of the 
hip- or shoulder-girdle took place although Kurz does not state 
The works of Phillipeaux and Fraisse were not accessible to the writer. 
Their conclusions were obtained from Barfurth’s review in Merkel and Bonnet’s 
Ergebnisse, vol. 1, 1891. 
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